Her Campus — a website and community for college women founded by Harvard grads Stephanie Kaplan Lewis, Windsor Hanger Western, and Annie Wang — celebrated the launch of its first book (“The Her Campus Guide to College Life: How to Manage Relationships, Stay Safe and Healthy, Handle Stress, and Have the Best Years of Your Life!”) with a party and signing at the Prudential Center Barnes & Noble on Saturday. The authors have another celebration for the book at the Harvard Coop on Tuesday, and then will head south for events in Atlanta and Tampa.